package com.mmall.service.impl;

import com.mmall.common.Const;
import com.mmall.common.ServerResponse;
import com.mmall.common.TokenCache;
import com.mmall.dao.UserMapper;
import com.mmall.pojo.User;
import com.mmall.service.IUserService;
import com.mmall.util.MD5Util;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.util.UUID;

/**
 * Created by geely
 */
@Service("iUserService")
public class UserServiceImpl implements IUserService {

  @Autowired
  private UserMapper userMapper;


  @Override
  public ServerResponse<User> login(String username, String password) {
    int resultCount = userMapper.checkUsername(username);
    if (resultCount == 0) {
      return ServerResponse.createByErrorMessage("用户名不存在");
    }

    String md5Password = MD5Util.MD5EncodeUtf8(password);
    User user = userMapper.selectLogin(username, md5Password);
    if (user == null) {
      return ServerResponse.createByErrorMessage("密码错误");
    }

    user.setPassword(org.apache.commons.lang3.StringUtils.EMPTY);
    return ServerResponse.createBySuccess("登录成功", user);
  }


  public ServerResponse<String> register(User user) {
    ServerResponse validResponse = this.checkValid(user.getUsername(), Const.USERNAME);
    if (!validResponse.isSuccess()) {
      return validResponse;
    }
    validResponse = this.checkValid(user.getEmail(), Const.EMAIL);
    if (!validResponse.isSuccess()) {
      return validResponse;
    }
    user.setRole(Const.Role.ROLE_CUSTOMER);
    //MD5加密
    user.setPassword(MD5Util.MD5EncodeUtf8(user.getPassword()));
    int resultCount = userMapper.insert(user);
    if (resultCount == 0) {
      return ServerResponse.createByErrorMessage("注册失败");
    }
    return ServerResponse.createBySuccessMessage("注册成功");
  }

  public ServerResponse<String> checkValid(String str, String type) {
    if (org.apache.commons.lang3.StringUtils.isNotBlank(type)) {
      //开始校验
      if (Const.USERNAME.equals(type)) {
        int resultCount = userMapper.checkUsername(str);
        if (resultCount > 0) {
          return ServerResponse.createByErrorMessage("用户名已存在");
        }
      }
      if (Const.EMAIL.equals(type)) {
        int resultCount = userMapper.checkEmail(str);
        if (resultCount > 0) {
          return ServerResponse.createByErrorMessage("email已存在");
        }
      }
    } else {
      return ServerResponse.createByErrorMessage("参数错误");
    }
    return ServerResponse.createBySuccessMessage("校验成功");
  }

  public ServerResponse selectQuestion(String username) {

    ServerResponse validResponse = this.checkValid(username, Const.USERNAME);
    if (validResponse.isSuccess()) {
      //用户不存在
      return ServerResponse.createByErrorMessage("用户不存在");
    }
    String question = userMapper.selectQuestionByUsername(username);
    if (org.apache.commons.lang3.StringUtils.isNotBlank(question)) {
      return ServerResponse.createBySuccess(question);
    }
    return ServerResponse.createByErrorMessage("找回密码的问题是空的");
  }

  public ServerResponse<String> checkAnswer(String username, String question, String answer) {
    int resultCount = userMapper.checkAnswer(username, question, answer);
    if (resultCount > 0) {
      //说明问题及问题答案是这个用户的,并且是正确的
      String forgetToken = UUID.randomUUID().toString();
      TokenCache.setKey(TokenCache.TOKEN_PREFIX + username, forgetToken);
      return ServerResponse.createBySuccess(forgetToken);
    }
    return ServerResponse.createByErrorMessage("问题的答案错误");
  }


  public ServerResponse<String> forgetResetPassword(String username, String passwordNew, String forgetToken) {
    if (org.apache.commons.lang3.StringUtils.isBlank(forgetToken)) {
      return ServerResponse.createByErrorMessage("参数错误,token需要传递");
    }
    ServerResponse validResponse = this.checkValid(username, Const.USERNAME);
    if (validResponse.isSuccess()) {
      //用户不存在
      return ServerResponse.createByErrorMessage("用户不存在");
    }
    String token = TokenCache.getKey(TokenCache.TOKEN_PREFIX + username);
    if (org.apache.commons.lang3.StringUtils.isBlank(token)) {
      return ServerResponse.createByErrorMessage("token无效或者过期");
    }

    if (org.apache.commons.lang3.StringUtils.equals(forgetToken, token)) {
      String md5Password = MD5Util.MD5EncodeUtf8(passwordNew);
      int rowCount = userMapper.updatePasswordByUsername(username, md5Password);

      if (rowCount > 0) {
        return ServerResponse.createBySuccessMessage("修改密码成功");
      }
    } else {
      return ServerResponse.createByErrorMessage("token错误,请重新获取重置密码的token");
    }
    return ServerResponse.createByErrorMessage("修改密码失败");
  }


  public ServerResponse<String> resetPassword(String passwordOld, String passwordNew, User user) {
    //防止横向越权,要校验一下这个用户的旧密码,一定要指定是这个用户.因为我们会查询一个count(1),如果不指定id,那么结果就是true啦count>0;
    int resultCount = userMapper.checkPassword(MD5Util.MD5EncodeUtf8(passwordOld), user.getId());
    if (resultCount == 0) {
      return ServerResponse.createByErrorMessage("旧密码错误");
    }

    user.setPassword(MD5Util.MD5EncodeUtf8(passwordNew));
    int updateCount = userMapper.updateByPrimaryKeySelective(user);
    if (updateCount > 0) {
      return ServerResponse.createBySuccessMessage("密码更新成功");
    }
    return ServerResponse.createByErrorMessage("密码更新失败");
  }


  public ServerResponse<User> updateInformation(User user) {
    //username是不能被更新的
    //email也要进行一个校验,校验新的email是不是已经存在,并且存在的email如果相同的话,不能是我们当前的这个用户的.
    int resultCount = userMapper.checkEmailByUserId(user.getEmail(), user.getId());
    if (resultCount > 0) {
      return ServerResponse.createByErrorMessage("email已存在,请更换email再尝试更新");
    }
    User updateUser = new User();
    updateUser.setId(user.getId());
    updateUser.setEmail(user.getEmail());
    updateUser.setPhone(user.getPhone());
    updateUser.setQuestion(user.getQuestion());
    updateUser.setAnswer(user.getAnswer());

    int updateCount = userMapper.updateByPrimaryKeySelective(updateUser);
    if (updateCount > 0) {
      return ServerResponse.createBySuccess("更新个人信息成功", updateUser);
    }
    return ServerResponse.createByErrorMessage("更新个人信息失败");
  }


  public ServerResponse<User> getInformation(Integer userId) {
    User user = userMapper.selectByPrimaryKey(userId);
    if (user == null) {
      return ServerResponse.createByErrorMessage("找不到当前用户");
    }
    user.setPassword(org.apache.commons.lang3.StringUtils.EMPTY);
    return ServerResponse.createBySuccess(user);

  }


  //backend

  /**
   * 校验是否是管理员
   *
   * @param user
   * @return
   */
  public ServerResponse checkAdminRole(User user) {
    if (user != null && user.getRole().intValue() == Const.Role.ROLE_ADMIN) {
      return ServerResponse.createBySuccess();
    }
    return ServerResponse.createByError();
  }


}
